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java.lang.Objectorg.apache.pig.impl.plan.Operator<PhyPlanVisitor>
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ExpressionOperator
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ConstantExpression
public class ConstantExpression
This class implements a Constant of any type. Its value can be set using the setValue method.
Field Summary |
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Fields inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator |
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alias, dummyBag, dummyBool, dummyDBA, dummyDouble, dummyFloat, dummyInt, dummyLong, dummyMap, dummyString, dummyTuple, illustrator, input, inputAttached, inputs, lineageTracer, outputs, parentPlan, pigLogger, reporter, requestedParallelism, resultType |
Fields inherited from class org.apache.pig.impl.plan.Operator |
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mKey |
Constructor Summary | |
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ConstantExpression(OperatorKey k)
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ConstantExpression(OperatorKey k,
int rp)
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Method Summary | |
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ConstantExpression |
clone()
Make a deep copy of this operator. |
protected Result |
genericGetNext(Object obj,
byte dataType)
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List<ExpressionOperator> |
getChildExpressions()
Get the child expressions of this expression |
Result |
getNext(Boolean b)
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Result |
getNext(DataBag db)
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Result |
getNext(DataByteArray ba)
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Result |
getNext(Double d)
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Result |
getNext(Float f)
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Result |
getNext(Integer i)
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Result |
getNext(Long l)
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Result |
getNext(Map m)
|
Result |
getNext(String s)
|
Result |
getNext(Tuple t)
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Object |
getValue()
|
Tuple |
illustratorMarkup(Object in,
Object out,
int eqClassIndex)
input tuple mark up to be illustrate-able |
String |
name()
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void |
setValue(Object value)
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boolean |
supportsMultipleInputs()
Indicates whether this operator supports multiple inputs. |
boolean |
supportsMultipleOutputs()
Indicates whether this operator supports multiple outputs. |
void |
visit(PhyPlanVisitor v)
Visit this node with the provided visitor. |
Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ExpressionOperator |
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accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, accumChild, containUDF, setIllustrator |
Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator |
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attachInput, cloneHelper, detachInput, getAlias, getAliasString, getDummy, getIllustrator, getInputs, getLogger, getNext, getPigLogger, getRequestedParallelism, getResultType, isAccumStarted, isAccumulative, isBlocking, isInputAttached, processInput, reset, setAccumEnd, setAccumStart, setAccumulative, setAlias, setInputs, setParentPlan, setPigLogger, setReporter, setRequestedParallelism, setResultType |
Methods inherited from class org.apache.pig.impl.plan.Operator |
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compareTo, equals, getOperatorKey, getProjectionMap, hashCode, regenerateProjectionMap, rewire, toString, unsetProjectionMap |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ConstantExpression(OperatorKey k)
public ConstantExpression(OperatorKey k, int rp)
Method Detail |
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public String name()
name
in class Operator<PhyPlanVisitor>
public boolean supportsMultipleInputs()
Operator
supportsMultipleInputs
in class Operator<PhyPlanVisitor>
public boolean supportsMultipleOutputs()
Operator
supportsMultipleOutputs
in class ExpressionOperator
public void visit(PhyPlanVisitor v) throws VisitorException
Operator
visit
in class ExpressionOperator
v
- Visitor to visit with.
VisitorException
- if the visitor has a problem.public Object getValue()
public void setValue(Object value)
protected Result genericGetNext(Object obj, byte dataType) throws ExecException
ExecException
public Result getNext(DataBag db) throws ExecException
getNext
in class ExpressionOperator
ExecException
public Result getNext(DataByteArray ba) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Double d) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Float f) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Integer i) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Long l) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(String s) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Tuple t) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Boolean b) throws ExecException
getNext
in class PhysicalOperator
ExecException
public Result getNext(Map m) throws ExecException
getNext
in class PhysicalOperator
ExecException
public ConstantExpression clone() throws CloneNotSupportedException
ExpressionOperator
clone
in class ExpressionOperator
CloneNotSupportedException
Do not use the clone method directly. Operators are cloned when logical plans
are cloned using {@link LogicalPlanCloner}
public List<ExpressionOperator> getChildExpressions()
getChildExpressions
in class ExpressionOperator
public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex)
Illustrable
in
- input tupleout
- output tuple before wrapped in ExampleTupleeqClassIndex
- index into equivalence classes in illustrator
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